package com.javasm.filter;

import com.alibaba.fastjson.JSON;
import com.javasm.common.BaseContext;
import com.javasm.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author：易鑫
 * @Version：1.0
 * @Date：2022/4/20-22:37
 * @Since:jdk1.8
 * @Description:
 */

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取本次请求uri
        String requestURI = request.getRequestURI();
        String[] usIs = new String[]{
                //放行的资源
               "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                //放行swagger api接口文档
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };

        //2.判断本次请求是否需要处理
        boolean check = check(usIs, requestURI);

        //3.不需要处理的话直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4-1.判断登录状态，已经登录直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);//将当前登录的用户id存入当前线程局部变量，以便在MyMetaObjecthandle中获取
            filterChain.doFilter(request,response);
            return;
        }

        //4-2.判断移动端登录状态，已经登录直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long empId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empId);//将当前登录的用户id存入当前线程局部变量，以便在MyMetaObjecthandle中获取
            filterChain.doFilter(request,response);
            return;
        }

        //5.未登录返回未登录结果
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param requestUri
     * @return
     */
    public boolean check(String[] uris ,String requestUri){
        for (String uri : uris) {
            boolean match = PATH_MATCHER.match(uri, requestUri);
            if (match){
                return true;
            }
        }
        return false;
    }
}
